Valve.



VVVV E.

1,259 639. Patented Mar. 19,1918.

Patented Mar. ia, 1918".

Application filed January 30, 1917. Ser'ial No'. 145,493.

To all whom it may concern:

Be it known that I, ALEXANDER LAING, a subject of the Kingof- Great Britaingresiding' at Sydney, in the Province of Nova Scotia and Dominion of Canada,- have in vented certain new and useful Improvements in Valves, of which the following is a specification.

This invention relates to valves and more particularly to a hydraulic valve for permitting the escape of excessive pressure in a pipe line or pump wherein it becomes necessary at times to obtain a reduction in the pressure within the pipe or pump after a certain pie-determined pressure has been reached.

One of the objects of the invention is to provide a reciprocatory valve member arrangecl within the casing and associated with a pipe Or high pressure pump so that an excessive pressure Within the pipe or pump will cause the valve to open and remain open until such time as the pressure has been properly reduced.

A further object of this invention is the provision of a valve which consists of comparatively few parts and is simple in construction, but durable and well adapted to withstand the rough usage to which devices of this character are ordinarily subjected.

For a full description of the invention and the advantages and merits thereof, reference is to be had to the following description and the accompanying drawings, wherein is illustrated the preferred form of my invention, in which;

Figure 1 is a Vertical section through a pot-valve showing a modified form of the invention associated therewith.

Fig. 2 is a fragmentary section on the line 5-5 of F ig. 1.

In F igs. 1 and 2 of the drawing, wherein I have illustrated two units of one form of my valve as it is associated with a pot-valve, the body of the main valve or pot-valve is provided with a partition in which a number of openings 14: are formed for receiving the neck 15 of the valve casing 16. The partition within the pot-valve body is also provided with depressions or recesses which receive portions of the casing so that the neck 14 may be projected entirely through its corresponding opening. The valve casing 16 extends upwardly above the upper surface of the partition and is open at its upper end; Arranged in--the open end of the casing is a cap 17 having an annular flange adapted to seat itself on the marginal edge of the casing. The pot-valve body is provided with a closure 18 throughwhieh screw threaded openings are formed for the reception of turn screws 19 one of which is provided for each valve unit. The end of the turn screw within the pot-valve body engages the center of the corresponding cap 17 so that by operating, the turn screw may be tightly held in position on the valve casing 16.

A sliding valve disk 20 is arranged within the valve casing 16 and is adapted to move upwardly and downwardlv therein so that it may be seated and unseated from its seat within the casing. A plurality of Circumferentially spaced openings 21 are provided in the wall of the casing 16 and these are disposed slightly above the valve seat so that when the valve disk is raised the openings 21 will form an outlet thereby opening 'the valve. The cap 17 is provided with openings communicating with the interior of the easing whereby communication is established between the interior of the pot-valve body and the interior of the casing 16. It is to be observed that there is no valve spring in this device as the valve is held in engagement with its seat by the pressure of water through the openings in the cap 17.

In steel plants, power houses and other similar establishments, especially where heavy duty hydraulic pumps are used it is necessary to frequently change the valve units in these pot-valves which are associated with the pumps. Considerable delay is encountered when the valves are required to be changed and they quickly become loosened so that they fail to seat properly against the pressure of the water in the pump. In the device described, the valve casing is held rigidly in the pot-valve body and the cap for the casing is tightly held in proper place as above'described. The operation of the valve disk with respect to its seat permits the same to be tightly closed when the pressure of water from the upper portion of the pot-valve acts upon the valve disk through the openings in the cap. When the pump is in operation, the intermittent operation of the plunger causes the valve disk to rise against the back pressure and permit the water that is being punped to pass through the openings in the easing.

The valve disk is sure to seat itself When valve body having a partition formed there in, a closure mounted on its open end, the said closure being provided With screw threaded openings, turn screWs nounted into the said valve units and extending into the said valve body, a pluraiity of valve units mounted upon the said partition and including casings having caps mounted thereon adapted to be engaged by the ends of the said turn screWs, the said partition having openings for the reception of the said valve units, Valve disks mounted Within the said easing, the said caps having a plu- 'ality of openings* 'for establishing communication between the interior of the said easing and the interior of the pot-valve body.

In testimony Whereof I afx my Signature in presence of two Witnesses.

J. STANLEY SMITH, WM. T. GALLOWAY.

Capie' of thin patent may be obtained for five cents each, by addressing the 'Commissioner oI 'Patents, Washington, D. C." 

